. Bulletin of the Department of Agriculture. Agriculture. 54 BULLETIN 932, U. S. DEPARTMENT OF AGRICULTURE. Table XXXIV.—Time of deposition, length of incubation, and time of hatching of eggs of the first brood of the codling moth, Grand Junction, Colo., 1916— Continued. Obser- vation No. Num- ber of eggs de- posited. Date- Number Appearance of— Incu- bation period. Deposi- ted. Red ring. Black spot. Hatched. Red ring. Black spot. 77 78 79 80 81 82 83 84 85 Total. 35 3 3 15 8 June 28 June 29 June 30 July 1 July 2 June 30 July 1 July 4 July 3 July 4 July 4 July 5 12 1 0 9 5 ? 0 Days. 2 2 3
. Bulletin of the Department of Agriculture. Agriculture. 54 BULLETIN 932, U. S. DEPARTMENT OF AGRICULTURE. Table XXXIV.—Time of deposition, length of incubation, and time of hatching of eggs of the first brood of the codling moth, Grand Junction, Colo., 1916— Continued. Obser- vation No. Num- ber of eggs de- posited. Date- Number Appearance of— Incu- bation period. Deposi- ted. Red ring. Black spot. Hatched. Red ring. Black spot. 77 78 79 80 81 82 83 84 85 Total. 35 3 3 15 8 June 28 June 29 June 30 July 1 July 2 June 30 July 1 July 4 July 3 July 4 July 4 July 5 12 1 0 9 5 ? 0 Days. 2 2 3 2 2 Days. 5 5" 5 Days. 6 0 6 6 7 0 0 July 6 July 7 July 7 July 8 July 9 4 2 July 3 July 5 July 7 July 8 July 10 July 11 3 5 8,774 6,597 Aver ' 10 1 5 14 6 Max Min Length of incubation.—The length of incubation and embryolog- ical changes of eggs of the first brood are given in Table XXXIV as follows: Average number of days from date of deposition to the appearance of the red ring days, maximum 10 days, minimum 1 day; average appearance of the black spot from time of deposition days, maximum 11 days, minimum 5 days; average incubation period days, maximum 14 days, minimum 6 days. Lar\ve of the First Brood. Ti?7ie of hatching.—The time of hatching of eggs of the first brood will be found in Table XXXIV. The first eggs of this brood hatched June 1; the last, July 11. Thus the period of incu- bation extended over one month, the maxi- mum number hatch- ing on June 16, or 15 days after the first larvae appeared. The rate of hatching is shown diagram- matically in figure 21, in which it will be noted that the majority of the larvae hatched about the middle of the hatching period. Length of the feeding 'period., stock-jar method.—The summarized account of the length of the feeding period of 817 larvae of the first. Fig. 21.—Time of batcbing of eggs of tlie first brood of the codling moth, Grand Junction, Colo., Please note that t
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